The famous jam study is real, and so are two meta-analyses that complicate it. What they agree on points to new visitors, not regulars.
“Too many choices hurt sales” is one of the most repeated findings in marketing. It comes from one elegant field experiment. The evidence since then is more interesting and more useful than the slogan.
In 2000, Sheena Iyengar and Mark Lepper set up a tasting table at Draeger’s, an upscale supermarket in Menlo Park, California, showing either 24 jams or 6. The large display drew more people: 60% of passersby stopped, against 40%. But of those who stopped, 3% bought a jar at the large display and nearly 30% at the small one Published.
A decade later, Benjamin Scheibehenne, Rainer Greifeneder and Peter Todd pooled 63 conditions from 50 published and unpublished experiments with 5,036 participants. They found “a mean effect size of virtually zero but considerable variance between studies” Published. On average, more options didn’t reduce choosing or satisfaction, and several attempts to reproduce overload effects hadn’t found them.
Then Alexander Chernev, Ulf Böckenholt and Joseph Goodman analyzed 99 observations covering 7,202 participants and asked when overload happens rather than whether it does on average. They identified four conditions that reliably make it more likely: a complex set of options, a difficult decision task, a chooser who is unsure what they want, and a goal of minimizing effort. With those taken into account, they found the overall effect of assortment size on overload was significant, “a finding counter to the data reported by prior meta-analytic research” Published.
So the honest summary: choice overload is not a law, and the jam result is not a typical effect. It’s a real effect that shows up under specific conditions and vanishes under others.
Chernev’s conditions sort your customers for you.
Solve choice overload for new visitors with curation. Don’t solve it by removing a regular’s product.
How to test a product page change for new visitors, and whether your traffic can carry the test, is in The Honest Test.
This is one chapter of The Catalog, which is free and readable in full on a single page with no form in front of it.